author | Matt Mackall <mpm@selenic.com> |
Mon, 09 Oct 2006 21:27:04 -0500 | |
changeset 3305 | e7abcf3a7c5f |
parent 3192 | 096f1c73cdc3 |
child 3886 | abaee83ce0a6 |
child 4102 | 544838cc1158 |
permissions | -rw-r--r-- |
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# mdiff.py - diff and patch routines for mercurial |
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# |
2858 | 3 |
# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
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# |
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# This software may be used and distributed according to the terms |
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# of the GNU General Public License, incorporated herein by reference. |
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from demandload import demandload |
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import bdiff, mpatch |
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demandload(globals(), "re struct util") |
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|
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def splitnewlines(text): |
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'''like str.splitlines, but only split on newlines.''' |
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lines = [l + '\n' for l in text.split('\n')] |
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if lines: |
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if lines[-1] == '\n': |
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lines.pop() |
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else: |
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lines[-1] = lines[-1][:-1] |
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return lines |
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|
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class diffopts(object): |
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'''context is the number of context lines |
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text treats all files as text |
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showfunc enables diff -p output |
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git enables the git extended patch format |
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nodates removes dates from diff headers |
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ignorews ignores all whitespace changes in the diff |
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ignorewsamount ignores changes in the amount of whitespace |
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ignoreblanklines ignores changes whose lines are all blank''' |
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defaults = { |
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'context': 3, |
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'text': False, |
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'showfunc': True, |
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'git': False, |
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'nodates': False, |
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'ignorews': False, |
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'ignorewsamount': False, |
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'ignoreblanklines': False, |
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} |
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|
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__slots__ = defaults.keys() |
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|
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def __init__(self, **opts): |
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for k in self.__slots__: |
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v = opts.get(k) |
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if v is None: |
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v = self.defaults[k] |
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setattr(self, k, v) |
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|
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defaultopts = diffopts() |
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|
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def unidiff(a, ad, b, bd, fn, r=None, opts=defaultopts): |
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def datetag(date): |
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return (opts.git or opts.nodates) and '\n' or '\t%s\n' % date |
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if not a and not b: return "" |
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epoch = util.datestr((0, 0)) |
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|
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if not opts.text and (util.binary(a) or util.binary(b)): |
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l = ['Binary file %s has changed\n' % fn] |
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elif not a: |
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b = splitnewlines(b) |
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if a is None: |
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l1 = '--- /dev/null%s' % datetag(epoch) |
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else: |
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l1 = "--- %s%s" % ("a/" + fn, datetag(ad)) |
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l2 = "+++ %s%s" % ("b/" + fn, datetag(bd)) |
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l3 = "@@ -0,0 +1,%d @@\n" % len(b) |
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l = [l1, l2, l3] + ["+" + e for e in b] |
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elif not b: |
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a = splitnewlines(a) |
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l1 = "--- %s%s" % ("a/" + fn, datetag(ad)) |
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if b is None: |
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l2 = '+++ /dev/null%s' % datetag(epoch) |
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else: |
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l2 = "+++ %s%s" % ("b/" + fn, datetag(bd)) |
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l3 = "@@ -1,%d +0,0 @@\n" % len(a) |
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l = [l1, l2, l3] + ["-" + e for e in a] |
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else: |
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al = splitnewlines(a) |
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bl = splitnewlines(b) |
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l = list(bunidiff(a, b, al, bl, "a/" + fn, "b/" + fn, opts=opts)) |
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if not l: return "" |
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# difflib uses a space, rather than a tab |
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l[0] = "%s%s" % (l[0][:-2], datetag(ad)) |
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l[1] = "%s%s" % (l[1][:-2], datetag(bd)) |
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for ln in xrange(len(l)): |
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if l[ln][-1] != '\n': |
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l[ln] += "\n\ No newline at end of file\n" |
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||
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if r: |
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l.insert(0, "diff %s %s\n" % |
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(' '.join(["-r %s" % rev for rev in r]), fn)) |
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|
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return "".join(l) |
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|
1637 | 100 |
# somewhat self contained replacement for difflib.unified_diff |
101 |
# t1 and t2 are the text to be diffed |
|
102 |
# l1 and l2 are the text broken up into lines |
|
103 |
# header1 and header2 are the filenames for the diff output |
|
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def bunidiff(t1, t2, l1, l2, header1, header2, opts=defaultopts): |
1637 | 105 |
def contextend(l, len): |
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106 |
ret = l + opts.context |
1637 | 107 |
if ret > len: |
108 |
ret = len |
|
109 |
return ret |
|
110 |
||
111 |
def contextstart(l): |
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ret = l - opts.context |
1637 | 113 |
if ret < 0: |
114 |
return 0 |
|
115 |
return ret |
|
116 |
||
117 |
def yieldhunk(hunk, header): |
|
118 |
if header: |
|
119 |
for x in header: |
|
120 |
yield x |
|
121 |
(astart, a2, bstart, b2, delta) = hunk |
|
122 |
aend = contextend(a2, len(l1)) |
|
123 |
alen = aend - astart |
|
124 |
blen = b2 - bstart + aend - a2 |
|
125 |
||
126 |
func = "" |
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if opts.showfunc: |
1637 | 128 |
# walk backwards from the start of the context |
129 |
# to find a line starting with an alphanumeric char. |
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130 |
for x in xrange(astart, -1, -1): |
|
131 |
t = l1[x].rstrip() |
|
132 |
if funcre.match(t): |
|
133 |
func = ' ' + t[:40] |
|
134 |
break |
|
135 |
||
136 |
yield "@@ -%d,%d +%d,%d @@%s\n" % (astart + 1, alen, |
|
137 |
bstart + 1, blen, func) |
|
138 |
for x in delta: |
|
139 |
yield x |
|
140 |
for x in xrange(a2, aend): |
|
141 |
yield ' ' + l1[x] |
|
142 |
||
143 |
header = [ "--- %s\t\n" % header1, "+++ %s\t\n" % header2 ] |
|
144 |
||
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145 |
if opts.showfunc: |
1637 | 146 |
funcre = re.compile('\w') |
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if opts.ignorewsamount: |
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148 |
wsamountre = re.compile('[ \t]+') |
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149 |
wsappendedre = re.compile(' \n') |
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150 |
if opts.ignoreblanklines: |
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151 |
wsblanklinesre = re.compile('\n') |
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152 |
if opts.ignorews: |
1637 | 153 |
wsre = re.compile('[ \t]') |
154 |
||
155 |
# bdiff.blocks gives us the matching sequences in the files. The loop |
|
156 |
# below finds the spaces between those matching sequences and translates |
|
157 |
# them into diff output. |
|
158 |
# |
|
159 |
diff = bdiff.blocks(t1, t2) |
|
160 |
hunk = None |
|
161 |
for i in xrange(len(diff)): |
|
162 |
# The first match is special. |
|
163 |
# we've either found a match starting at line 0 or a match later |
|
164 |
# in the file. If it starts later, old and new below will both be |
|
165 |
# empty and we'll continue to the next match. |
|
166 |
if i > 0: |
|
167 |
s = diff[i-1] |
|
168 |
else: |
|
169 |
s = [0, 0, 0, 0] |
|
170 |
delta = [] |
|
171 |
s1 = diff[i] |
|
172 |
a1 = s[1] |
|
173 |
a2 = s1[0] |
|
174 |
b1 = s[3] |
|
175 |
b2 = s1[2] |
|
176 |
||
177 |
old = l1[a1:a2] |
|
178 |
new = l2[b1:b2] |
|
179 |
||
180 |
# bdiff sometimes gives huge matches past eof, this check eats them, |
|
181 |
# and deals with the special first match case described above |
|
182 |
if not old and not new: |
|
183 |
continue |
|
184 |
||
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185 |
if opts.ignoreblanklines: |
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186 |
wsold = wsblanklinesre.sub('', "".join(old)) |
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187 |
wsnew = wsblanklinesre.sub('', "".join(new)) |
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188 |
if wsold == wsnew: |
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189 |
continue |
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190 |
|
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parents:
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|
191 |
if opts.ignorewsamount: |
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192 |
wsold = wsamountre.sub(' ', "".join(old)) |
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193 |
wsold = wsappendedre.sub('\n', wsold) |
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194 |
wsnew = wsamountre.sub(' ', "".join(new)) |
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195 |
wsnew = wsappendedre.sub('\n', wsnew) |
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|
196 |
if wsold == wsnew: |
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197 |
continue |
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|
198 |
|
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parents:
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changeset
|
199 |
if opts.ignorews: |
1637 | 200 |
wsold = wsre.sub('', "".join(old)) |
201 |
wsnew = wsre.sub('', "".join(new)) |
|
202 |
if wsold == wsnew: |
|
203 |
continue |
|
204 |
||
205 |
astart = contextstart(a1) |
|
206 |
bstart = contextstart(b1) |
|
207 |
prev = None |
|
208 |
if hunk: |
|
209 |
# join with the previous hunk if it falls inside the context |
|
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parents:
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diff
changeset
|
210 |
if astart < hunk[1] + opts.context + 1: |
1637 | 211 |
prev = hunk |
212 |
astart = hunk[1] |
|
213 |
bstart = hunk[3] |
|
214 |
else: |
|
215 |
for x in yieldhunk(hunk, header): |
|
216 |
yield x |
|
217 |
# we only want to yield the header if the files differ, and |
|
218 |
# we only want to yield it once. |
|
219 |
header = None |
|
220 |
if prev: |
|
221 |
# we've joined the previous hunk, record the new ending points. |
|
222 |
hunk[1] = a2 |
|
223 |
hunk[3] = b2 |
|
224 |
delta = hunk[4] |
|
225 |
else: |
|
226 |
# create a new hunk |
|
227 |
hunk = [ astart, a2, bstart, b2, delta ] |
|
228 |
||
229 |
delta[len(delta):] = [ ' ' + x for x in l1[astart:a1] ] |
|
230 |
delta[len(delta):] = [ '-' + x for x in old ] |
|
231 |
delta[len(delta):] = [ '+' + x for x in new ] |
|
232 |
||
233 |
if hunk: |
|
234 |
for x in yieldhunk(hunk, header): |
|
235 |
yield x |
|
236 |
||
120
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Add a function to return the new text from a binary diff
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parents:
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diff
changeset
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237 |
def patchtext(bin): |
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|
238 |
pos = 0 |
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|
239 |
t = [] |
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|
240 |
while pos < len(bin): |
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diff
changeset
|
241 |
p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12]) |
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|
242 |
pos += 12 |
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|
243 |
t.append(bin[pos:pos + l]) |
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parents:
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|
244 |
pos += l |
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diff
changeset
|
245 |
return "".join(t) |
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Add a function to return the new text from a binary diff
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changeset
|
246 |
|
0
9117c6561b0b
Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff
changeset
|
247 |
def patch(a, bin): |
1379 | 248 |
return mpatch.patches(a, [bin]) |
432 | 249 |
|
1379 | 250 |
patches = mpatch.patches |
2078
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Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
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diff
changeset
|
251 |
patchedsize = mpatch.patchedsize |
432 | 252 |
textdiff = bdiff.bdiff |